Subaru Legacy 2004 Service Manual page 908

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 CHECK POWER SUPPLY LINE.
1) Turn the ignition switch to ON.
2) Measure the voltage between fuel injector
and engine ground on faulty cylinders.
Connector & terminal
#1 (E5) No. 2 (+) — Engine ground (
#2 (E16) No. 2 (+) — Engine ground (
#3 (E6) No. 2 (+) — Engine ground (
#4 (E17) No. 2 (+) — Engine ground (
8 CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector
on faulty cylinder.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM con-
nector and chassis ground on faulty cylinders.
Connector & terminal
#1 (B136) No. 6 (+) — Chassis ground (
#2 (B136) No. 5 (+) — Chassis ground (
#3 (B136) No. 4 (+) — Chassis ground (
#4 (B136) No. 3 (+) — Chassis ground (
9 CHECK FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between fuel injec-
tor terminals on faulty cylinder.
Terminals
No. 1 — No. 2:
10 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR.
11 CHECK CRANK SPROCKET.
Remove the timing belt cover.
12 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cyl-
inder block.
Check
Is the voltage more than 10 V? Repair the poor
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Is the voltage more than 10 V? Repair the battery
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Is the resistance less than 1
!?
Is the camshaft position sensor
or crankshaft position sensor
loosely installed?
Is the crank sprocket rusted or
does it have broken teeth?
Is the timing belt dislocated
from its proper position?
EN(H4SO 2.5)(diag)-149
ENGINE (DIAGNOSTICS)
Yes
Repair the har-
contact in all con- ness and connec-
nectors in fuel tor.
injector circuit.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
on faulty cylinders
• Poor contact in
coupling connector
• Poor contact in
main relay connec-
tor
• Poor contact in
fuel injector con-
nector on faulty
cylinders
Go to step 9.
short circuit in har-
ness between
ECM and fuel
injector. After
repair, replace the
ECM. <Ref. to
FU(H4SO 2.5)-36,
Engine Control
Module (ECM).>
Replace the faulty Go to step 10.
fuel injector <Ref.
to FU(H4SO 2.5)-
31, Fuel Injector.>
and ECM <Ref. to
FU(H4SO 2.5)-36,
Engine Control
Module (ECM).>
Tighten the cam- Go to step 11.
shaft position sen-
sor or crankshaft
position sensor.
Replace the crank Go to step 12.
sprocket. <Ref. to
ME(H4SO 2.0)-50,
Crank Sprocket.>
Repair the installa- Go to step 13.
tion condition of
timing belt. <Ref.
to ME(H4SO 2.0)-
43, Timing Belt.>
No